Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07J—STEROIDS
  • C07J63/00—Steroids in which the cyclopenta(a)hydrophenanthrene skeleton has been modified by expansion of only one ring by one or two atoms
  • C07J63/008—Expansion of ring D by one atom, e.g. D homo steroids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/56—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids
  • A61K31/58—Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives thereof, e.g. steroids containing heterocyclic rings, e.g. danazol, stanozolol, pancuronium or digitogenin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
  • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
  • A61P31/18—Antivirals for RNA viruses for HIV
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

• the present invention relates to novel compounds useful against HIV, and more particularly, to compounds derived from betulinic acid and other structurally-related compounds which are useful as HIV maturation inhibitors, and to pharmaceutical compositions containing same, as well as to methods for their preparation.
• HrV-1 human immunodeficiency virus -1 infection
• HIV and AIDS immunodeficiency syndrome
• RT nucleoside reverse transcriptase
• AZT didanosine
• VIDEX didanosine
• stavudine or ZERIT ®
• lamivudine or 3TC or EPIVIR ®
• zalcitabine or DDC or HIVID ®
• abacavir succinate or ZIAGEN ®
• Tenofovir disoproxil fumarate salt or VIREAD ®
• emtricitabine or FTC - EMTRIVA ®
• COMBIVIR ® contains -3TC plus AZT
• TRIZIVIR ® contains abacavir, lamivudine, and zidovudine
• EPZICOM contains abacavir and lamivudine
• TRUVAD A ® (contains VIREAD ® and EMTRIVA ® ); non-nucleoside reverse
• transcriptase inhibitors nevirapine (or VIRAMUNE ® ), delavirdine (or RESCRIPTOR ® ) and efavirenz (or SUSTIVA ® ), ATRIPLA ® (TRUVADA ® + SUSTIVA ® ), and etravirine, and peptidomimetic protease inhibitors or approved formulations: saquinavir, indinavir, ritonavir, nelfinavir, amprenavir, lopinavir, KALETRA ® (lopinavir and Ritonavir), darunavir, atazanavir (REYATAZ ® ) and tipranavir (APTIVUS ® ) and cobicistat, and integrase inhibitors such as raltegravir (ISENTRESS ), and entry inhibitors such as enfuvirtide (T-20) (FUZEON ® ) and maraviroc (SELZENTRY ® ).
• novel anti-HIV agents exhibiting distinct resistance patterns, and favorable pharmacokinetic as well as safety profiles are needed to provide more treatment options.
• Improved HIV fusion inhibitors and HIV entry coreceptor antagonists are two examples of new classes of anti-HIV agents further being studied by a number of investigators.
• HIV attachment inhibitors are a further subclass of antiviral compounds that bind to the HIV surface glycoprotein gpl20, and interfere with the interaction between the surface protein gpl20 and the host cell receptor CD4. Thus, they prevent HIV from attaching to the human CD4 T-cell, and block HIV replication in the first stage of the HIV life cycle.
• the properties of HIV attachment inhibitors have been improved in an effort to obtain compounds with maximized utility and efficacy as antiviral agents.
• US 7,354,924 and US 7,745,625 are illustrative of HIV attachment inhibitors.
• HIV maturation inhibitors Another emerging class of compounds for the treatment of HIV are called HIV maturation inhibitors. Maturation is the last of as many as 10 or more steps in HIV replication or the HIV life cycle, in which HIV becomes infectious as a consequence of several HIV protease-mediated cleavage events in the gag protein that ultimately results in release of the capsid (CA) protein. Maturation inhibitors prevent the HIV capsid from properly assembling and maturing, from forming a protective outer coat, or from emerging from human cells. Instead, non-infectious viruses are produced, preventing subsequent cycles of HIV infection. Certain derivatives of betulinic acid have now been shown to exhibit potent anti-
• the present invention provides compounds of Formulas I and II below, including pharmaceutically acceptable salts thereof, their pharmaceutical formulations, and their use in patients suffering from or susceptible to a virus such as HIV.
• the compounds of Formulas I and II are effective antiviral agents, particularly as inhibitors of HIV. They are useful for the treatment of HIV and AIDS.
• One embodiment of the present invention is directed to a compound, including pharmaceutically acceptable salts thereof, which is selected from the group of: a compound of formula I
• Formula II wherein X is selected from the group of phenyl, heteroaryl ring, C 4 _8 cycloalkyl, C 4 _s cycloalkenyl, C4-9 spirocycloalkyl, C4-9 spirocycloalkenyl, C 4 -8 oxacycloalkyl, C 4 -8 dioxacycloalkyl, C6-8 oxacycloalkenyl, C6-8 dioxacycloalkenyl, Ce cyclodialkenyl, Ce oxacyclodialkenyl, Ce-9 oxaspirocycloalkyl and Ce-9 oxaspirocycloalkenyl ring; and further wherein X is substituted with A, wherein A is at least one member selected from the group of -H, -halo, -hydroxyl, -Ci- 6 alkyl, -Ci_6 alkoxy, -Ci- 6 alkyl-
• Qi is selected from the group of aryl, heteroaryl, substituted heteroaryl, -OR 2 , - COOR3, -NR 2 R 2 , -S0 2 R 7 , -CONHS0 2 R 3 , and -CONHS0 2 NR 2 R 2 ;
• Y is selected from the group of -COOR 2 , -C(0)NR 2 S0 2 R 3 , - C(0)NHS0 2 NR 2 R 2 ,
• n l-6;
• Ri is selected from the group of:
• W is absent, or is -CH2 or -CO;
• Z is selected from the group of -NR 28 R 2 9, -OR 30 , -COOR 2 , -CONRi 8 Ri 9 , F, CI, Br, and I;
• U is selected from the group of -NR 28 R 2 9, -OR 30 , -COOR 2 , -CONRi 8 Ri 9 , F, CI, Br, I, aryl and heteroaryl;
• R 2 is selected from the group of -H, benzyl, -Ci-6 alkyl, -alkylsubstituted Ci-6 alkyl and - arylsubstituted Ci_6 alkyl;
• R3 is benzyl, -Ci_6 alkyl or -alkylsubstituted Ci_6 alkyl;
• R4 is selected from the group of -H, -Ci_6 alkyl, -Ci_6 alkyl-C(OR3) 2 -C3_6 cycloalkyl, -Ci_6 substituted alkyl, -Ci_6 alkyl-C 3 _6 cycloalkyl, -Ci_6 alkyl-Q 2 , -Ci_6 alkyl-C 3 _6 cycloalkyl-Q 2 , heteroaryl, -CORe, -COCOR 6 , -S0 2 R 7 , -S0 2 NR 2 R 2 , wherein Q 2 is selected from the group of heteroaryl, substituted heteroaryl, F, CI, Br, I, -CF 3 , -OR 2 , -COOR 2 , -NR 8 R 9
• R4 and R5 can be taken together with the adjacent N to form
• R6 is selected from the group of -Ci_6 alkyl, -Ci_6 alkyl-substitutedalkyl, -C 3 -6 cycloalkyl, - C3-6 substitutedcycloalkyl-Q 3 , -Ci_6 alkyl-Q 3 , -Ci_6 alkyl-substitutedalkyl-Q 3 ,-C3-6 cycloalkyl-Q 3 , aryl-Q 3 , -NR13R14, and -ORi 5 ; wherein Q3 is selected from the group of aryl, heteroaryl, substituted heteroaryl, -OR 2 , - COOR 2 , -NR 8 R 9 , S0 2 R 7 , -CONHS0 2 R 3 , and -CONHS0 2 NR 2 R 2 ;
• R7 is selected from the group of -Ci_6 alkyl, -Ci_6 substituted alkyl, -C 3 -6 cycloalkyl, -CF 3 , aryl, and heteroaryl;
• Rs and R 9 are independently selected from the group of -H, -Ci_6 alkyl, -Ci_6 substituted alkyl, aryl, heteroaryl, substituted aryl, substituted heteroaryl, and -Ci-6 alkyl-Q 2 ;
• R 8 can also be -COOR 3 ;
• R 9 can also be independently selected from the group of
• V is selected from the group of -CR24R25, -S0 2 , -O and -NR 12 ;
• M is selected from the group of -CHR24R25, -NR 26 R27, -SO2R7, -SO2NR3R3 and -OH;
• Rio and Rn are independently selected from the group of -H, -Ci_6 alkyl, -C 1-6 substituted alkyl and -C3-6 cycloalkyl,
• Ri2 is selected from the group of -Ci_6 alkyl, -Ci_6 alkyl-OH; -Ci_6 alkyl, -Ci_6 substituted alkyl,-C 3 -6 cycloalkyl, -COR7, -COONRi 8 Ri9, -SOR7, and -SONR20R21;
• Ri 3 and R14 are independently selected from the group of -H, -Ci_6 alkyl, -C3-6 cycloalkyl, -Ci-6 substituted alkyl, -Ci_6 alkyl-Q 4 , -Ci_6 alkyl-C3_6 cycloalkyl-Q 4 , Ci_6 substituted alkyl- Q 4 and
• Ri 3 and R14 are taken together with the adjacent N to form a cycle selected from the group of:
• Ri5 is selected from the group of -Ci_6 alkyl, -C3-6 cycloalkyl, -Ci_6 substituted alkyl, -Ci_6 alkyl-Q 4 , -Ci_ 6 alkyl-C3- 6 cycloalkyl-Q 4 and -Ci_6 substituted alkyl-Q 4;
• Q 4 is selected from the group of heteroaryl, substituted heteroaryl, -NR2R2, -CONR2R2, - COOR2, -OR2, and -SO2R3;
• Ri6 is selected from the group of -H, -Ci-6 alkyl, -NR2R2, and -COOR3; Ri7 is selected from the group of -H, -Ci_6 alkyl, -COOR 3 , and aryl; Ri 8 and R1 9 are independently selected from the group of H, -Ci_6 alkyl, -Ci_6 substituted alkyl, and -Ci-6 cycloalkyl;
• Ri 8 can also be -COOR 3 ;
• Ri 8 and R1 9 are taken together with the adjacent N to form a cycle selected from the group of
• R2 0 and R21 are independently from the group of H, -Ci_6 alkyl, -Ci_6 substituted alkyl, -Ci_ 6 alkyl-Q 5 , -Ci_6 cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl,
• Q5 is selected from the group of halogen and SO2R 3
• R24 and R25 are selected from the group of -H, -Ci_6 alkyl, -alkylsubstituted Ci_6 alkyl, - SO2R3, -SO2NR2R2 or -OH, -NR2R2, -NR2SO2R3, -NR2COR3 and -NR 2 CONR 2 R 2 ;
• R24 and R25 can be selected from the group of -OH, - NR2R2, -NR2SO2R3, -NR2COR3 and -NR2CONR2R2;
• R2 6 and R27 are independently selected from the group of -H, -Ci_6 alkyl, -alkylsubstituted Ci-6 alkyl, -C1-3 alkylaryl, -CO2R2 and -SO2R7;
• R26 and R27 can be selected from the group of -CO2R2 or
• R2 8 and R2 9 are independently selected from the group of -H, -Ci_6 alkyl, -alkylsubstituted Ci_6 alkyl, - C 3 - 6 cycloalkyl, -Ci_ 6 alkyl-Q 6 , -COCi_ 6 alkyl-Q 6; -COOR 3 ; -COCF 3 ;
• R28 can also be selected from -COOR3 and -CO RisRw;
• R2 8 and R2 9 are taken together with the adjacent N to form a cycle selected from the group of:
• R30 is selected from the group of H, -Ci-6 alkyl, -alkylsubstituted Ci-6 alkyl, - C3-6 cycloalkyl, and -Ci_6 alkyl-Q 6;
• Q 6 is selected from the group of H,-OR 2 , -COOR 2 , -COCOOR2, -NR31R32;
• R 3 1 and R 32 are independently selected from the group of -H, -Ci_6 alkyl, -C 1-6 substituted alkyl, -C e substituted alkyl-OR2, and -COR3, or R 3 1 and R 3 2 are taken together with the adjacent N to form a cycle selected from the group of
• R 33 is selected from the group of -H, -C e alkyl, -C e substituted alkyl, and -C e substituted alkyl-Q 7 ,
• Q 7 is selected from the group of -COOR2 and -COONR2R2.
• a method for treating mammals infected with a virus, especially wherein said virus is HIV comprising administering to said mammal an antiviral effective amount of a compound which is selected from the group of compounds of Formulas I and II above, and one or more pharmaceutically acceptable carriers, excipients or diluents.
• the compound of Formulas I and/or II can be administered in combination with an antiviral effective amount of another- AIDS treatment agent selected from the group of: (a) an AIDS antiviral agent; (b) an anti-infective agent; (c) an immunomodulator; and (d) other HIV entry inhibitors.
• Another embodiment of the present invention is a pharmaceutical composition
• a pharmaceutical composition comprising an antiviral effective amount of a compound which is selected from the group of compounds of Formulas I and II, and one or more pharmaceutically acceptable carriers, excipients, and diluents; and optionally in combination with an antiviral effective amount of another AIDS treatment agent selected from the group of: (a) an AIDS antiviral agent; (b) an anti-infective agent; (c) an immunomodulator; and (d) other HIV entry inhibitors.
• another AIDS treatment agent selected from the group of: (a) an AIDS antiviral agent; (b) an anti-infective agent; (c) an immunomodulator; and (d) other HIV entry inhibitors.
• the present invention is directed to these, as well as other important ends, hereinafter described.
• the present disclosure includes the individual diastereoisomeric and enantiomeric forms of the compounds of Formulas I and II, in addition to the mixtures thereof.
• H refers to hydrogen, including its isotopes, such as deuterium.
• C l _ 6 alkyl as used herein and in the claims (unless specified otherwise) mean straight or branched chain alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, amyl, hexyl and the like.
• C j -C 4 fluoroalkyl refers to F-substituted C x -C 4 alkyl wherein at least one H atom is substituted with F atom, and each H atom can be independently substituted by F atom;
• Halogen refers to chlorine, bromine, iodine or fluorine.
• aryl refers to an all carbon monocyclic or fused-ring polycyclic (i.e., rings which share adjacent pairs of carbon atoms) groups having a completely conjugated pi-electron system. Examples, without limitation, of aryl groups are phenyl, napthalenyl and anthracenyl. The aryl group may be substituted or unsubstituted.
• the substituted group(s) is preferably one or more selected from alkyl, cycloalkyl, aryl, heteroaryl, heteroalicyclic, hydroxy, alkoxy, aryloxy, heteroaryloxy, heteroalicycloxy, thiohydroxy, thioaryloxy, thioheteroaryloxy, thioheteroalicycloxy, cyano, halogen, nitro, carbonyl, O-carbamyl, N-carbamyl, C-amido, N-amido, C-carboxy, O-carboxy, sulfinyl, sulfonyl, sulfonamido, trihalomethyl, ureido, amino and -NR x R y , wherein R x and R y are independently selected from the group of hydrogen, alkyl, cycloalkyl, aryl, carbonyl, C-carboxy, sulfonyl, trihalomethyl, and, and,
• heteroaryl refers to a monocyclic or fused ring (i.e., rings which share an adjacent pair of atoms) group having in the ring(s) one or more atoms selected from the group of nitrogen, oxygen and sulfur and, in addition, having a completely conjugated pi-electron system. Unless otherwise indicated, the heteroaryl group may be attached at either a carbon or nitrogen atom within the heteroaryl group. It should be noted that the term heteroaryl is intended to encompass an N-oxide of the parent heteroaryl if such an N-oxide is chemically feasible as is known in the art.
• heteroaryl groups are furyl, thienyl, benzothienyl, thiazolyl, imidazolyl, oxazolyl, oxadiazolyl, thiadiazolyl, benzothiazolyl, triazolyl, tetrazolyl, isoxazolyl, isothiazolyl, pyrrolyl, pyranyl, tetrahydropyranyl, pyrazolyl, pyridyl, pyrimidinyl, quinolinyl, isoquinolinyl, purinyl, carbazolyl, benzoxazolyl, benzimidazolyl, indolyl, isoindolyl, pyrazinyl.
• the substituted group(s) is preferably one or more selected from alkyl, cycloalkyl, aryl, heteroaryl, heteroalicyclic, hydroxy, alkoxy, aryloxy, heteroaryloxy, heteroalicycloxy, thioalkoxy, thiohydroxy, thioaryloxy, thioheteroaryloxy, thioheteroalicycloxy, cyano, halogen, nitro, carbonyl, O-carbamyl, N-carbamyl, C-amido, N-amido, C-carboxy, O-carboxy, sulfinyl, sulfonyl, sulfonamido, trihalomethyl, ureido, amino, and -NR x R y , wherein R x and R y are as defined above.
• heteroalicyclic refers to a monocyclic or fused ring group having in the ring(s) one or more atoms selected from the group of nitrogen, oxygen and sulfur. Rings are selected from those which provide stable arrangements of bonds and are not intended to encompass systems which would not exist. The rings may also have one or more double bonds. However, the rings do not have a completely conjugated pi-electron system. Examples, without limitation, of heteroalicyclic groups are azetidinyl, piperidyl, piperazinyl, imidazolinyl, thiazolidinyl, 3-pyrrolidin-l-yl, morpholinyl, thiomorpholinyl and tetrahydropyranyl.
• the substituted group(s) is preferably one or more selected from alkyl, cycloalkyl, aryl, heteroaryl, heteroalicyclic, hydroxy, alkoxy, aryloxy, heteroaryloxy, heteroalicycloxy, thiohydroxy, thioalkoxy, thioaryloxy, thioheteroaryloxy, thioheteroalicycloxy, cyano, halogen, nitro, carbonyl, thiocarbonyl, O-carbamyl, N-carbamyl, O-thiocarbamyl, N-thiocarbamyl, C- amido, C-thioamido, N-amido, C-carboxy, O-carboxy, sulfinyl, sulfonyl, sulfonamido, trihalomethanesulfonamido, trihalomethanesulfonyl, silyl, guanyl, guanidino, ure
• alkyl group refers to a saturated aliphatic hydrocarbon including straight chain and branched chain groups.
• the alkyl group has 1 to 20 carbon atoms (whenever a numerical range; e.g., "1-20", is stated herein, it means that the group, in this case the alkyl group may contain 1 carbon atom, 2 carbon atoms, 3 carbon atoms, etc. up to and including 20 carbon atoms). More preferably, it is a medium size alkyl having 1 to 10 carbon atoms. Most preferably, it is a lower alkyl having 1 to 4 carbon atoms.
• the alkyl group may be substituted or unsubstituted.
• the substituent group(s) is preferably one or more individually selected from trihaloalkyl, cycloalkyl, aryl, heteroaryl, heteroalicyclic, hydroxy, alkoxy, aryloxy, heteroaryloxy,
• thioheteroalicycloxy cyano, halo, nitro, carbonyl, thiocarbonyl, O-carbamyl, N-carbamyl, O-thiocarbamyl, N-thiocarbamyl, C-amido, C-thioamido, N-amido, C-carboxy, O- carboxy, sulfinyl, sulfonyl, sulfonamido, trihalomethanesulfonamido,
• a "cycloalkyl” group refers to an all-carbon monocyclic or fused ring (i.e., rings which share and adjacent pair of carbon atoms) group wherein one or more rings does not have a completely conjugated pi-electron system.
• examples, without limitation, of cycloalkyl groups are cyclopropane, cyclobutane, cyclopentane, cyclopentene, cyclohexane, cyclohexene, cycloheptane, cycloheptene and adamantane.
• a cycloalkyl group may be substituted or unsubstituted.
• the substituent group(s) is preferably one or more individually selected from alkyl, aryl, heteroaryl, heteroalicyclic, hydroxy, alkoxy, aryloxy, heteroaryloxy, heteroalicycloxy, thiohydroxy, thioalkoxy, thioaryloxy, thioheteroaryloxy, thioheteroalicycloxy, cyano, halo, nitro, carbonyl, thiocarbonyl, O-carbamyl, N-carbamyl, O-thiocarbamyl, N-thiocarbamyl, C-amido, C- thioamido, N-amido, C-carboxy, O-carboxy, sulfinyl, sulfonyl, sulfonamido, trihalomethanesulfonamido, trihalomethanesulfonyl, silyl, amidino, guanidino, ureido,
• alkenyl refers to an alkyl group, as defined herein, having at least two carbon atoms and at least one carbon-carbon double bond.
• alkynyl group refers to an alkyl group, as defined herein, having at least two carbon atoms and at least one carbon-carbon triple bond.
• a “hydroxy” group refers to an -OH group.
• An “alkoxy” group refers to both an -O-alkyl and an -O-cycloalkyl group as defined herein.
• aryloxy refers to both an -O-aryl and an -O-heteroaryl group, as defined herein.
• heteroaryloxy refers to a heteroaryl-O- group with heteroaryl as defined herein.
• heteroalicycloxy refers to a heteroalicyclic-O- group with
• a “thiohydroxy” group refers to an -SH group.
• a “thioalkoxy” group refers to both an S-alkyl and an -S-cycloalkyl group, as defined herein.
• a "thioaryloxy” group refers to both an -S-aryl and an -S-heteroaryl group, as defined herein.
• a “thioheteroaryloxy” group refers to a heteroaryl-S- group with heteroaryl as defined herein.
• a "thioheteroalicycloxy” group refers to a heteroalicyclic-S- group with heteroalicyclic as defined herein.
• aldehyde refers to a carbonyl group where R" is hydrogen.
• O-carboxy refers to a R"C(-0)0-group, with R" as defined herein.
• a “carboxylic acid” group refers to a C-carboxy group in which R" is hydrogen.
• a “trihalomethyl” group refers to a -CZ 3 , group wherein Z is a halogen group as defined herein.
• a "trihalomethanesulfonyl” group refers to an groups with Z as defined above.
• a “trihalomethanesulfonamido” group refers to a group with Z as defined above and R x being H or (Ci-6)alkyl.
• amino refers to an -NH 2 group.
• a “cyano” group refers to a -CN group.
• a “silyl” group refers to a -Si(R")3, with R" being (Ci-6)alkyl or phenyl.
• a “hydrazino” group refers to a -NR x NR y R y2 group, with R x , R y , and R y2 independently being H or (Ci_6)alkyl.
• "4, 5, or 6 membered ring cyclic N-lactam” group refers to
• Any two adjacent R groups may combine to form an additional aryl, cycloalkyl, heteroaryl or heterocyclic ring fused to the ring initially bearing those R groups.
• salts and prodrugs of compounds disclosed herein are within the scope of the invention.
• pharmaceutically acceptable salt as used herein and in the claims is intended to include nontoxic base addition salts. Suitable salts include those derived from organic and inorganic acids such as, without limitation, hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid, methanesulfonic acid, acetic acid, tartaric acid, lactic acid, sulfinic acid, citric acid, maleic acid, fumaric acid, sorbic acid, aconitic acid, salicylic acid, phthalic acid, and the like.
• organic and inorganic acids such as, without limitation, hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid, methanesulfonic acid, acetic acid, tartaric acid, lactic acid, sulfinic acid, citric acid, maleic acid, fumaric acid, sorbic acid, aconitic acid, salicylic acid, phthalic acid, and
• pharmaceutically acceptable salt as used herein is also intended to include salts of acidic groups, such as a carboxylate, with such counterions as ammonium, alkali metal salts, particularly sodium or potassium, alkaline earth metal salts, particularly calcium or magnesium, and salts with suitable organic bases such as lower alkylamines
• substituted lower alkylamines e.g. hydroxyl-substituted alkylamines such as diethanolamine
• the compounds of the invention also include “prodrugs”.
• prodrug as used herein encompasses both the term “prodrug esters” and the term “prodrug ethers”.
• C-19 and C-3 refer to certain positions of a triterpene core as numbered in accordance with IUPAC rules (positions depicted below with respect to an illustrative triterpene: betulin):
• the invention is directed to a compound, including pharmaceutically acceptable salts thereof, which is selected from the group of: a compound of formula I
• Formula II wherein X is selected from the group of phenyl, heteroaryl ring, C 4 _8 cycloalkyl, C 4 _s cycloalkenyl, C4-9 spirocycloalkyl, C4-9 spirocycloalkenyl, C 4 -8 oxacycloalkyl, C 4 -8 dioxacycloalkyl, C6-8 oxacycloalkenyl, C6-8 dioxacycloalkenyl, Ce cyclodialkenyl, Ce oxacyclodialkenyl, Ce-9 oxaspirocycloalkyl and Ce-9 oxaspirocycloalkenyl ring; and further wherein X is substituted with A, wherein A is at least one member selected from the group of -H, -halo, -hydroxyl, -Ci- 6 alkyl, -Ci_6 alkoxy, -Ci- 6 alkyl-
• Qi is selected from the group of aryl, heteroaryl, substituted heteroaryl, -OR 2 , - COOR3, -NR 2 R 2 , -S0 2 R 7 , -CONHS0 2 R 3 , and -CONHS0 2 NR 2 R 2 ;
• Y is selected from the group of -COOR 2 , -C(0)NR 2 S0 2 R 3 , - C(0)NHS0 2 NR 2 R 2 ,
• n l-6;
• Ri is selected from the group of:
• W is absent, or is -CH2 or -CO;
• Z is selected from the group of -NR 28 R 2 9, -OR 30 , -COOR 2 , -CONRi 8 Ri 9 , F, CI, Br, and I;
• U is selected from the group of -NR 28 R 2 9, -OR 30 , -COOR 2 , -CONRi 8 Ri 9 , F, CI, Br, I, aryl and heteroaryl;
• R 2 is selected from the group of -H, benzyl, -Ci-6 alkyl, -alkylsubstituted Ci-6 alkyl and - arylsubstituted Ci_6 alkyl;
• R3 is benzyl, -Ci_6 alkyl or -alkylsubstituted Ci_6 alkyl;
• R4 is selected from the group of -H, -Ci_6 alkyl, -Ci_6 alkyl-C(OR3) 2 -C3_6 cycloalkyl, -Ci_6 substituted alkyl, -Ci_6 alkyl-C 3 _6 cycloalkyl, -Ci_6 alkyl-Q 2 , -Ci_6 alkyl-C 3 _6 cycloalkyl-Q 2 , heteroaryl, -CORe, -COCOR 6 , -S0 2 R 7 , -S0 2 NR 2 R 2 , wherein Q 2 is selected from the group of heteroaryl, substituted heteroaryl, F, CI, Br, I, -CF 3 , -OR 2 , -COOR 2 , -NR 8 R 9
• R 4 and R5 can be taken together with the adjacent N to form
• R6 is selected from the group of -Ci_6 alkyl, -Ci_6 alkyl-substitutedalkyl, -C 3 -6 cycloalkyl, - C3-6 substitutedcycloalkyl-Q 3 , -Ci_6 alkyl-Q 3 , -Ci_6 alkyl-substitutedalkyl-Q 3 ,-C3-6 cycloalkyl-Q 3 , aryl-Q 3 , -NR13R14, and -ORi 5 ; wherein Q3 is selected from the group of aryl, heteroaryl, substituted heteroaryl, -OR 2 , - COOR 2 , -NR 8 R 9 , S0 2 R 7 , -CONHS0 2 R 3 , and -CONHS0 2 NR 2 R 2 ;
• R7 is selected from the group of -Ci_6 alkyl, -Ci_6 substituted alkyl, -C 3 -6 cycloalkyl, -CF 3 , aryl, and heteroaryl;
• Rs and R 9 are independently selected from the group of -H, -Ci_6 alkyl, -Ci_6 substituted alkyl, aryl, heteroaryl, substituted aryl, substituted heteroaryl, -Ci-6 alkyl-Q 2 , and -
• R 8 can also be -COOR 3 ;
• R 9 can also be independently selected from the group of
• V is selected from the group of -CR24R25, -S0 2 , -O and -NR 12 ;
• M is selected from the group of -CHR24R25, -NR 26 R27, -SO2R7, -SO2NR3R3 and -OH;
• Rio and Rn are independently selected from the group of -H, -Ci_6 alkyl, -C 1-6 substituted alkyl and -C3-6 cycloalkyl,
• Ri2 is selected from the group of -C e alkyl, -C e alkyl-OH; -Ci_6 alkyl, -Ci
• alkyl alkyl,-C 3 -6 cycloalkyl, -COR7, -COONRi 8 Ri9, -SOR7, and -SONR20R21;
• Ri 3 and R14 are independently selected from the group of -H, -Ci_6 alkyl, -C3-6 cycloalkyl, -Ci-6 substituted alkyl, -Ci_6 alkyl-Q 4 , -Ci_6 alkyl-C3_6 cycloalkyl-Q 4 , Ci_6 substituted alkyl- Q 4 and
• Ri 3 and R14 are taken together with the adjacent N to form a cycle selected from the group of:
• Ri5 is selected from the group of -Ci_6 alkyl, -C3-6 cycloalkyl, -Ci_6 substituted alkyl, -Ci_6 alkyl-Q 4 , -Ci_ 6 alkyl-C3- 6 cycloalkyl-Q 4 and -Ci_6 substituted alkyl-Q 4;
• Q 4 is selected from the group of heteroaryl, substituted heteroaryl, -NR2R2, -CONR2R2, - COOR2, -OR2, and -SO2R3;
• Ri6 is selected from the group of -H, -Ci-6 alkyl, -NR2R2, and -COOR3; Ri7 is selected from the group of -H, -Ci_6 alkyl, -COOR 3 , and aryl; Ri 8 and R1 9 are independently selected from the group of H, -Ci_6 alkyl, -Ci_6 substituted alkyl, and -Ci-6 cycloalkyl;
• Ri 8 can also be -COOR 3 ;
• Ri 8 and R1 9 are taken together with the adjacent N to form a cycle selected from the group of
• R2 0 and R21 are independently from the group of H, -Ci_6 alkyl, -Ci_6 substituted alkyl, -Ci_ 6 alkyl-Q 5 , -Ci_6 cycloalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl,
• Q5 is selected from the group of halogen and SO2R 3
• R24 and R25 are independently selected from the group of -H, -Ci_6 alkyl, -alkylsubstituted Ci_6 alkyl, -S0 2 R 3 , -S0 2 NR 2 R 2 or -OH, -NR 2 R 2 , -NR 2 S0 2 R 3 , -NR 2 COR 3 and -
• R24 and R25 can be selected from the group of -OH, - NR2R2, -NR2SO2R3, -NR2COR3 and -NR2CONR2R2;
• R2 6 and R27 are independently selected from the group of -H, -Ci_6 alkyl, -alkylsubstituted Ci-6 alkyl, -C 1-3 alkylaryl, Ci- 3 alkylheteroaryl, -CO2R2 and -S0 2 R 7 ;
• R2 6 and R27 can be selected from the group of -CO2R2 or
• R2 8 and R2 9 are independently selected from the group of H, -Ci_6 alkyl, -alkylsubstituted Ci_6 alkyl, - C 3 - 6 cycloalkyl, -C 1-6 alkyl-Q 6 , -COCi_ 6 alkyl-Q 6> -COOR 3 ; -COCF 3 ;
• R28 can also be selected from -COOR3 and -CO RisRw;
• R28 and R29 are taken together with the adjacent N to form a cycle selected from the group of:
• R 30 is selected from the group of H, -Ci_6 alkyl, -alkylsubstituted Ci_6 alkyl, - C3-6 cycloalkyl, and -Ci_6 alkyl-Q 6;
• Q 6 is selected from the group of H,-OR 2 , -COOR2, -COCOOR2, and -NR31R32;
• R 3 1 and R 32 are independently selected from the group of -H, -Ci_6 alkyl, -Ci_6 substituted alkyl, -Ci_6 substituted alkyl-OR2, and -COR3,
• R 3 1 and R 3 2 are taken together with the adjacent N to form a cycle selected from the group of
• R 33 is selected from the group of -H, -Ci_6 alkyl, -Ci_6 substituted alkyl, and -Ci_6 substituted alkyl- ,
• Q 7 is selected from the group of -COOR2 and -COONR2R2.
• compounds of Formula I and II are preferred wherein X is phenyl. Also preferred are compounds wherein A is -H or halo, especially -F. Further preferred are compounds wherein Y is -COOR 2 . It is also preferred that R 2 is -H.
• embodiments described above may be administered orally, parenterally (including subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques), by inhalation spray, or rectally, and by other means, in dosage unit formulations containing non-toxic pharmaceutically acceptable carriers, excipients and diluents available to the skilled artisan.
• One or more adjuvants may also be included.
• a method of treatment for treating viral infections such as HIV infection and AIDS.
• the treatment involves administering to a patient in need of such treatment a pharmaceutical composition which contains an antiviral effective amount of one or more of the compounds of Formulas I and II, together with one or more pharmaceutically acceptable carriers, excipients or diluents.
• antiviral effective amount means the total amount of each active component of the composition and method that is sufficient to show a meaningful patient benefit, i.e., inhibiting, ameliorating, or healing of acute conditions characterized by inhibition of the HIV infection.
• the term refers to that ingredient alone.
• compositions of the invention may be in the form of orally administrable suspensions or tablets; as well as nasal sprays, sterile injectable
• compositions for example, as sterile injectable aqueous or oleaginous suspensions or suppositories.
• Pharmaceutically acceptable carriers, excipients or diluents may be utilized in the pharmaceutical compositions, and are those utilized in the art of pharmaceutical preparations.
• these compositions When administered orally as a suspension, these compositions are prepared according to techniques typically known in the art of pharmaceutical formulation and may contain microcrystalline cellulose for imparting bulk, alginic acid or sodium alginate as a suspending agent, methylcellulose as a viscosity enhancer, and sweeteners/flavoring agents known in the art.
• these compositions may contain microcrystalline cellulose, dicalcium phosphate, starch, magnesium stearate and lactose and/or other excipients, binders, extenders, disintegrants, diluents, and lubricants known in the art.
• the injectable solutions or suspensions may be formulated according to known art, using suitable non-toxic, parenterally acceptable diluents or solvents, such as mannitol, 1,3-butanediol, water, Ringer's solution or isotonic sodium chloride solution, or suitable dispersing or wetting and suspending agents, such as sterile, bland, fixed oils, including synthetic mono- or diglycerides, and fatty acids, including oleic acid.
• suitable non-toxic, parenterally acceptable diluents or solvents such as mannitol, 1,3-butanediol, water, Ringer's solution or isotonic sodium chloride solution, or suitable dispersing or wetting and suspending agents, such as sterile, bland, fixed oils, including synthetic mono- or diglycerides, and fatty acids, including oleic acid.
• the compounds herein set forth can be administered orally to humans in a dosage range of about 1 to 100 mg/kg body weight in divided doses, usually over an extended period, such as days, weeks, months, or even years.
• One preferred dosage range is about 1 to 10 mg/kg body weight orally in divided doses.
• Another preferred dosage range is about 1 to 20 mg/kg body weight in divided doses. It will be understood, however, that the specific dose level and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the host undergoing therapy.
• the compounds of Formulas I and II herein set forth may be effectively administered, whether at periods of pre-exposure and/or post-exposure, in combination with effective amounts of the AIDS antivirals, immunomodulators, antiinfectives, or vaccines, such as those in the following non-limiting table:
• Famciclovir Smith Kline herpes zoster Famciclovir Smith Kline herpes zoster
• ARC asymptomatic HIV positive, also in combination with AZT/ddl/ddC
• Ribavirin (Costa Mesa, CA) positive, LAS, ARC
• VX-478 Vertex HIV infection, AIDS,
• VREAD ® fumarate salt
• reverse transcriptase inhibitor reverse transcriptase inhibitor
• TAK-652 Takeda HIV infection
• VIREAD ® VIREAD ®
• EMTRIVA' Emtricitabine
• SUSTIVA ® Efavirenz
• Interleukin-2 CD4 cell counts (aldeslukin)
• Tumor Necrosis Genentech ARC in combination Factor; TNF w/gamma Interferon
• HIV entry inhibitors examples include DRUGS OF THE FUTURE 1999, 24(12), pp. 1355-1362; CELL, Vol. 9, pp.
• HIV attachment inhibitors are also set forth in US
• Preferred combinations are simultaneous or alternating treatments with a compound of the present disclosure and an inhibitor of HIV protease and/or a non- nucleoside inhibitor of HIV reverse transcriptase.
• An optional fourth component in the combination is a nucleoside inhibitor of HIV reverse transcriptase, such as AZT, 3TC, ddC or ddl.
• a preferred inhibitor of HIV protease is REYATAZ ® (active ingredient
• Atazanavir typically a dose of 300 to 600mg is administered once a day. This may be co-administered with a low dose of Ritonavir (50 to 500mgs).
• Another preferred inhibitor of HIV protease is KALETRA ® .
• indinavir is the sulfate salt of N-(2(R)-hydroxy-l-(S)-indanyl)-2(R)-phenylmethyl- 4-(S)-hydroxy-5-(l-(4-(3-pyridyl-methyl)-2(S)-N'-(t-butylcarboxamido)-piperazinyl))- pentaneamide ethanolate, and is synthesized according to U.S. 5,413,999.
• Indinavir is generally administered at a dosage of 800 mg three times a day.
• Other preferred protease inhibitors are nelfinavir and ritonavir.
• HIV protease is saquinavir which is administered in a dosage of 600 or 1200 mg tid.
• Preferred non- nucleoside inhibitors of HIV reverse transcriptase include efavirenz. These combinations may have unexpected effects on limiting the spread and degree of infection of HIV.
• Preferred combinations include those with the following (1) indinavir with efavirenz, and, optionally, AZT and/or 3TC and/or ddl and/or ddC; (2) indinavir, and any of AZT and/or ddl and/or ddC and/or 3TC, in particular, indinavir and AZT and 3TC; (3) stavudine and 3TC and/or zidovudine; (4) tenofovir disoproxil fumarate salt and emtricitabine.
• the compound of the present invention and other active agents may be administered separately or in conjunction.
• the administration of one element may be prior to, concurrent to, or subsequent to the administration of other agent(s).
• NBS N-bromosuccinimine
• TBDMS tert-butyldimethylsilane
• NMO 4-methylmorpholine-N-oxide
• TEA triethylamine
• DIPEA N,N-diisopropylethylamine
• HATU [0-(7-azabenzotriazol-l-yl)-l, l,3,3-tetramethyluronium hexafluorophosphate]
• AIBN azobisisobutyronitrile
• TBAF tetrabutylammonium fluoride
• PCC pyridinium chlorochromate
• Tf 2 NPh (trifluoromethylsulfonyl)methanesulfonamide
• ⁇ g microgram(s)
• CDCI 3 ( ⁇ ⁇ 7.26), CD 3 OD ( ⁇ ⁇ 3.30), Acetic-d4 (Acetic Acid d 4 ) ( ⁇ ⁇ 1 1.6, 2.07), DMSO mix or DMS0-D6_CDC1 3 (( H 2.50 and 8.25) (ratio 75%:25%), and DMSO-D6 ( ⁇ ⁇ 2.50).
• Solvent A 95% water, 5% methanol, 10 mM ammonium acetate
• Solvent B 5% water, 95% methanol, 10 mM ammonium acetate
• Column Xbridge CI 8 5 ⁇ 4.6 x 50 mm
• Solvent A 95% water, 5% methanol, 10 mM ammonium acetate
• Solvent B 5% water, 95% methanol, 10 mM ammonium acetate
• Column Phenomenex Luna CI 8, 5 ⁇ , 3.0 x 50 mm
• Solvent A 95% water, 5% acetonitrile, lOmM ammonium acetate
• Solvent B 5% water, 95% acetonitrile, lOmM ammonium acetate
• Column Phenomenex Luna CI 8, 3 ⁇ , 2.0 x 30 mm Method 4
• Solvent A 95% water, 5% methanol, 10 mM ammonium acetate
• Solvent B 5% water, 95% methanol, 10 mM ammonium acetate
• Column Phenomenex Luna CI 8, 3 ⁇ , 2.0 x 30 mm
• Solvent A 90% water, 10% Acetonitrile, 0.1% TFA
• Solvent B 10% Acetonitrile, 90% water, 0.1% TFA
• Solvent B 95% MeOH - 5% H 2 0 - 10 mM Ammonium Acetate
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 95% water, 5% acetonitrile, 10 mM ammonium acetate
• Solvent B 5% water, 95% acetonitrile, 10 mM ammonium acetate
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent B 95% MeOH - 5% 3 ⁇ 40 - 10 mM Ammonium Acetate
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 95% water, 5% acetonitrile, 10 mM ammonium acetate
• Solvent B 5% water, 95% acetonitrile, 10 mM ammonium acetate
• Solvent A 95% water, 5% acetonitrile, 10 mM ammonium acetate
• Solvent B 5% water, 95% acetonitrile, 10 mM ammonium acetate
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 95% water, 5% MeOH, 10 mM ammonium bicarbonate
• Solvent B 5% water, 95% MeOH, 10 mM ammonium bicarbonate
• Solvent A Water - 20 mM Ammonium Acetate
• Solvent B 95% Acetonitrile - 5% 3 ⁇ 40 - 20 mM Ammonium Acetate
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent B 95% MeOH - 5% H 2 0 - 10 mM Ammonium Acetate
• Solvent A 90% water - 10% acetonitrile, 0.1% TFA
• Solvent B 10% water - 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• Solvent A 90% water, 10% acetonitrile, 0.1% TFA
• Solvent B 10% water, 90% acetonitrile, 0.1% TFA
• the flask was attached to a reflux condenser, flushed with 2 and heated to reflux overnight. The mixture was then cooled to rt and diluted with water (75 mL). The mixture was extracted with ethyl acetate (3 x 75 mL) and washed with brine (75 mL). The combined organic layers were dried with MgS0 4 , filtered, and concentrated under reduced pressure. The residue was adsorbed to silica gel and purified by silica gel flash chromatography using a 0-20% ethyl acetate in hexanes gradient.
• the resulting white slurry was heated to 100 °C. After 5 h, the reaction was allowed to cool to rt and was then diluted with EtOAc and washed with IN NaOH (2 x 70 mL). The combined aqueous layer was extracted with EtOAc (2 x 150 mL). The combined organic layer was dried over Na 2 S0 4 , filtered and concentrated to a slurry (75 mL) which was stored in a refrigerator overnight. The slurry was filtered and the white solid product was washed with Et 2 0. The liquid filtrate was concentrated to a yellow slurry which was filtered and washed with Et 2 0 to give more white solid product.
• the white suspension was blanketed with nitrogen.
• the vessel was sealed and warmed to 1 15-125°C for 48 h.
• the crude reaction was filtered through a short bed of silica gel and washed with ethyl acetate.
• the filtrate was concentrated in vacuo and purified by silica gel chromatography eluted with ethyl acetate and hexanes (0-50%) to afford the title compound as a colorless foam (566 mg, 73%).
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bR)-benzyl 9-(4-(tert- butoxycarbonyl)phenyl)-5a,5b,8,8, 11 a-pentamethyl- 1 -(prop- l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la,l lb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylate
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bR)-tert- butyldimethylsilyl 9-(4-(tert-butoxycarbonyl)phenyl)-5a,5b,8,8,l 1 a-pentamethyl- l-(prop- l-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la,l lb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylate.
• Intermediate 5 Intermediate 5
• the mixture was flushed with nitrogen and was heated to 60 °C. After 3.5 h of heating, the mixture was cooled to rt and was filtered through a pad of silica gel and celite which was washed with dichloromethane followed by 25% ethyl acetate in hexanes. The filtrate was concentrated under reduced pressure. The mixture was diluted with 200 mL of water and was extracted with dichloromethane (3 x 200 mL). The combined organic layers were dried with sodium sulfate, filtered, and concentrated under reduced pressure to give
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bR)-benzyl 9-(3-fluoro- 4-(methoxycarbonyl)phenyl)-5a,5b,8,8, 1 la-pentamethyl-1 -(prop- 1 -en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la,l lb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylate.
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,l laS, l lbR, 13aR, 13bR)-9-(3-fluoro-4- (methoxycarbonyl)phenyl)-5a,5b,8,8, l la-pentamethyl-l-(prop-l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8, l l, l la, l lb, 12, 13, 13a, 13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylic acid.
• the mixture was flushed with 2 and heated to 60 °C for 1 h.
• the mixture was cooled to rt and was filtered through a plug of celite and silica gel (washed with 25% EtOAc in hexanes).
• the filtrate was concentrated under reduced pressure.
• the residue was diluted with 25 mL of dioxane and TBAF (75% in water) (2.76 g, 7.91 mmol) was added.
• the mixture was stirred for 30 minutes at rt then was diluted with 50 mL of IN HC1.
• the solids that formed were collected by filtration and were washed with water to give the title compound (2.95 g, 4.99 mmol, 95% yield) as a white solid.
• Step 3 Preparation of methyl 2-fluoro-4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bR)- 3a-isocyanato-5a,5b,8,8,l la-pentamethyl-l-(prop-l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)benzoate.
• Step 4 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bR)-3a- amino-5a,5b,8,8,l la-pentamethyl-l-(prop-l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)-2-fluorobenzoate dihydrochloride.
• Intermediate 6 Intermediate 6.
• Example 1 -6 were prepared either from intermediate 2 or 5 following the scheme below:
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-tert- butyldimethylsilyl l-(3-bromoprop-l-en-2-yl)-9-(4-(methoxycarbonyl)phenyl)- 5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- carboxylate
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-tert- butyldimethylsilyl l-(3-bromoprop-l-en-2-yl)-9-(4-(tert-butoxycarbonyl)phenyl)- 5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylate
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(2-hydroxyethylamino)prop-l-en-2-yl)-5a,5b,8,8,lla pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,ll a ? llb ? 12,13,13a,13b-octadecahydro-lH cyclopenta [a] chrysene-3a-carboxylic acid
• Step 3 Removal of protecting g
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(dimethylamino)prop-l-en-2-yl)-5a,5b,8,8,lla- pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- lic acid
• Step 3 To a solution of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(dimethylamino)prop-l-en-2-yl)-5a,5b,8,8,l la- pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,l la,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylic acid (25 mg, 0.038 mmol) in DCM (0.5 mL) was added TFA (0.1 mL, 1.298 mmol).
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-((2-(dimethylamino)ethyl)(methyl)amino)prop-l-en-2- yl)-5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid
• Step 3 To a solution of (lR,3aS,5aR,5bR,7aR, l laS, l lbR, 13aR, 13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-((2-(dimethylamino)ethyl)(methyl)amino)prop-l-en-2-yl)- 5a,5b,8,8, l la-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,l l, l la, l lb,12, 13, 13a, 13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid (0.025 g, 0.035 mmol) in DCM (0.5 mL) was added TFA (0.1 mL, 1.298 mmol).
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(2-(dimethylamino)ethylamino)prop-l-en-2-yl)- 5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid
• Step 3 To a solution of (lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)- 1 -(3 -(2-(dimethylamino)ethylamino)prop- 1 -en-2-yl)- 5a,5b,8,8,l la-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la,l lb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid (25 mg, 0.036 mmol) in DCM (0.5 mL) was added TFA (0.1 mL, 1.298 mmol). The mixture was stirred at rt for 15.5h then was concentrated under a stream of nitrogen and the residue
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(3-ethoxy-3-oxopropylamino)prop-l-en-2-yl)- 5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid
• Step 3 To a solution of (lR,3aS,5aR,5bR,7aR, l laS, l lbR, 13aR, 13bS)-9-(4-(tert- butoxycarbonyl)phenyl)- 1 -(3 -(3 -ethoxy-3 -oxopropylamino)prop- 1 -en-2-yl)- 5a,5b,8,8, l la-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la, l lb, 12,13,13a, 13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid (0.035 g, 0.048 mmol) in DCM (0.5 mL) was added TFA (0.1 mL, 1.298 mmol).
• the mixture was stirred at rt for 21.5h then the solvent was removed under a stream of nitrogen.
• the crude product was dissolved in 0.5 mL of dioxane and 0.4 mL of IN NaOH was added to the mixture. It was warmed to 75 °C 18.25h then was cooled to rt.
• the mixture was diluted with 1 mL of methanol and was purified by prep HPLC (method 1). The fractions containing the expected product were combined and concentrated under reduced pressure to
• Step 1 Preparation of tert-butyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)- 3a-(2-(dimethylamino)ethylcarbamoyl)-l-(3-(dimethylamino)prop-l-en-2-yl)- 5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- benzoate
• Step 2 To a solution of tert-butyl 4-((lR,3aS,5aR,5bR,7aR, l laS, l lbR,13aR,13bS)-3a- (2-(dimethylamino)ethylcarbamoyl)-l-(3-(dimethylamino)prop-l-en-2-yl)-5a,5b,8,8,l la- pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8, l l,l la, l lb,12, 13, 13a, 13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)benzoate (55.3 mg, 0.076 mmol) in DCM (1 mL) was added TFA (0.1 mL, 1.298 mmol).
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-((2-(dimethylamino)ethyl)(methyl)amino)prop-l-en-2- yl)-5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid —
• Step 2 Preparation of tert-butyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-l- (3-((2-(dimethylamino)ethyl)(methyl)amino)prop-l-en-2-yl)-3a-(2- (dimethylamino)ethylcarbamoyl)-5a,5b,8,8,lla-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysen-9-yl)benzoate
• Step 3 To a solution of tert-butyl 4-((lR,3aS,5aR,5bR,7aR, l laS, l lbR,13aR,13bS)-l-(3- ((2-(dimethylamino)ethyl)(methyl)amino)prop- 1 -en-2-yl)-3 a-(2- (dimethylamino)ethylcarbamoyl)-5a,5b,8,8, 1 la-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8, l l, l la, l lb, 12, 13, 13a, 13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)benzoate (40.8 mg, 0.052 mmol) in DCM (1 mL) was added TFA (0.1 mL, 1.298 mmol).
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-l-(3-(tert- butoxycarbonyl(2-(dimethylamino)ethyl)amino)prop-l-en-2-yl)-9-(4-(tert- butoxycarbonyl)phenyl)-5a,5b,8,8,lla-pentamethyl-
• Step 2 Preparation of tert-butyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-l- (3-(tert-butoxycarbonyl(2-(dimethylamino)ethyl)amino)prop-l-en-2-yl)-3a-(3- ethoxy-3-oxopropylcarbamoyl)-5a,5b,8,8,lla-pentamethyl-
• Step 3 Preparation of 3-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-l-(3-(tert- butoxycarbonyl(2-(dimethylamino)ethyl)amino)prop-l-en-2-yl)-9-(4-(tert- butoxycarbonyl)phenyl)-5a,5b,8,8,lla-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysene-3a-carboxamido)propanoic acid
• Step 4 BOC deprotection: To a solution of 3- ((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-l-(3-(tert-butoxycarbonyl(2-
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(methylamino)prop-l-en-2- yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxylic acid
• Step 2 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-9-(4-(tert- butoxycarbonyl)phenyl)-l-(3-(4-methoxy-N-methyl-4-oxobutanamido)prop-l-en-2- yl)-5a,5b,8,8,lla-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b- octadecahydro-lH-cyclopenta[a]chrysene-3a-carboxylic acid
• Step 3 Preparation of tert-butyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)- 3a-(3-ethoxy-3-oxopropylcarbamoyl)-l-(3-(4-methoxy-N-methyl-4- oxobutanamido)prop-l-en-2-yl)-5a,5b,8,8,lla-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysen-9-yl)benzoate
• Step 4 Preparation of 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a-(3- ethoxy-3-oxopropylcarbamoyl)-l-(3-(4-methoxy-N-methyl-4-oxobutanamido)prop-l- en-2-yl)-5a,5b,8,8,lla-pentamethyl-
• Step 5 To a solution of 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-3a-(3-ethoxy-
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-benzyl l-(3- bromoprop-l-en-2-yl)-9-(4-(methoxycarbonyl)phenyl)-5a,5b,8,8,lla-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- e
• Step 2 Preparation of 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a- (benzyloxycarbonyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2-morpholinoethoxy)prop-l- en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)benzoic acid
• Step 3 To a solution of 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-3a- (benzyloxycarbonyl)-5a,5b,8,8,l la-pentamethyl-l-(3-(2-morpholinoethoxy)prop-l-en-2- yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la,l lb,12,13,13a,13b-octadecahydro-lH- cyclopenta[a]chrysen-9-yl)benzoic acid (0.078 g, 0.00 ⁇ ) in DCE (2 mL) was added triethylamine (0.022 mL, 0.160 mmol), tert-butyldimethylsilane (0.033 mL, 0.200 mmol), and palladium (II) acetate (
• the mixture was flushed with nitrogen and was heated to 60 °C for 5.5h, then was cooled to rt and stirred overnight.
• the mixture was filtered through a pad of celite to remove the solids (washed with dichloromethane) and the filtrate was concentrated under reduced pressure.
• the residue was dissolved in THF (2 mL) and was treated with tetrabutylammonium fluoride hydrate (0.042 g, 0.150 mmol). After 1.25h, the mixture was diluted with water (5 mL) and extracted with dichloromethane (3 x 7 mL). The combined organic layers were dried with sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by crystallization from hot dioxane and water.
• Step 1 Preparation of (lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-benzyl 9-(4- (methoxycarbonyl)phenyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-
• Step 3 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a- (3-ethoxy-3-oxopropylcarbamoyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-
• Step 4 To a solution of methyl 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-3a-(3- ethoxy-3-oxopropylcarbamoyl)-5a,5b,8,8,l la-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la, 1 lb, 12,13,13a, 13b- octadecahydro-lH-cyclopenta[a]chrysen-9-yl)benzoate (0.032 g, 0.040 mmol) in 1,4- dioxane (1 mL) was added NaOH (IN) (0.199 mL, 0.199 mmol).
• Step 1 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a- (2-(2-hydroxyethylamino)ethylcarbamoyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-
• Step 2 To a solution of methyl 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)-3a-(2- (2-hydroxyethylamino)ethylcarbamoyl)-5a,5b,8,8,l la-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,l l,l la, 1 lb, 12,13,13a, 13b- octadecahydro-lH-cyclopenta[a]chrysen-9-yl)benzoate (0.019 g, 0.024 mmol) in 1,4- dioxane (1 mL) was added IN NaOH (0.121 mL, 0.121 mmol). The mixture was heated to 75 °C for 23h then was cooled to r
• Step 1 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a-
• Step 2 To a solution of methyl 4-((lR,3aS,5aR,5bR,7aR, l laS, l lbR, 13aR, 13bS)-3a-(2- (dimethylamino)ethylcarbamoyl)-5a,5b,8,8, l la-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8, l 1, 1 la, 1 lb, 12, 13, 13a, 13b- octadecahydro-lH-cyclopenta[a]chrysen-9-yl)benzoate (38.4 mg, 0.050 mmol) in 1,4- dioxane (1 mL) was added IN NaOH (0.249 mL, 0.249 mmol).
• Step 1 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)- 5a,5b,8,8,lla-pentamethyl-l-(3-(2-morpholinoethoxy)prop-l-en-2-yl)-3a-(3-(2- oxopyrrolidin-l-yl)propylcarbamoyl)-
• Step 2 To a solution of methyl 4-((lR,3aS,5aR,5bR,7aR,l laS,l lbR,13aR,13bS)- 5a,5b,8,8,l la-pentamethyl-l-(3-(2-morpholinoethoxy)prop-l-en-2-yl)-3a-(3-(2- oxopyrrolidin-l-yl)propylcarbamoyl)-2,3,3a,4,5,5a,5b,6,7,7a,8,l 1,1 la, 1 lb,12, 13, 13 a, 13b- octadecahydro-lH-cyclopenta[a]chrysen-9-yl)benzoate (0.0364 g, 0.044 mmol) in 1,4- Dioxane (1 mL) was added IN NaOH (0.220 mL, 0.220 mmol).
• Step 1 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a- (3-(lH-imidazol-l-yl)propylcarbamoyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysen-9-yl)benzoate
• Step 2 To a solution of methyl 4-((lR,3aS,5aR,5bR,7aR, l laS, l lbR,13aR,13bS)-3a-(3- ( 1 H-imidazol- 1 -yl)propylcarbamoyl)-5a,5b, 8, 8, 1 1 a-pentamethyl- 1-(3-(2- morpholinoethoxy)prop-l-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8, l l,l la, 1 lb, 12,13, 13a, 13b- octadecahydro-lH-cyclopenta[a]chrysen-9-yl)benzoate (0.0108 g, 0.013 mmol) in 1,4- dioxane (1 mL) was added IN NaOH (0.067 mL, 0.067 mmol).
• Step 1 Preparation of methyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)-3a- (2-(2-methoxy-2-oxoethylamino)ethylcarbamoyl)-5a,5b,8,8,lla-pentamethyl-l-(3-(2- morpholinoethoxy)prop-l-en-2-yl)- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysen-9-yl)benzoate
• Step 2 To a solution of 2-(2-((lR,3aS,5aR,5bR,7aR, l laS, l lbR, 13aR, 13bS)-9-(4- (methoxycarbonyl)phenyl)-5a,5b,8,8, l la-pentamethyl-l-(3-(2-morpholinoethoxy)prop-l- en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8, l l, l la, l lb, 12, 13, 13a, 13b-octadecahydro-lH- cyclopenta[a]chrysene-3a-carboxamido)ethylamino)acetic acid (30 mg, 0.026 mmol) in 1,4-dioxane (1 mL) was added IN NaOH (0.2 mL, 0.200 mmol).
• Step 1 Preparation of tert-butyl 4-((lR,3aS,5aR,5bR,7aR,llaS,llbR,13aR,13bS)- 3a-(2-(dimethylamino)ethylcarbamoyl)-l-(3-(4-methoxy-N-methyl-4- oxobutanamido)prop-l-en-2-yl)-5a,5b,8,8,lla-pentamethyl- 2,3,3a,4,5,5a,5b,6,7,7a,8,ll,lla,llb,12,13,13a,13b-octadecahydro-lH- cyclopenta [a] chrysen-9-yl)benzoate
• Step 2 To a solution of tert-butyl 4-((lR,3aS,5aR,5bR,7aR, l laS, l lbR,13aR,13bS)-3a- (2-(dimethylamino)ethylcarbamoyl)-l-(3-(4-methoxy-N-methyl-4-oxobutanamido)prop- l-en-2-yl)-5a,5b,8,8,l 1 a-pentamethyl-

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